Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Income Taxes          
Provision for income taxes, as a percentage of income before income taxes 30.50% 26.40% 25.70% 21.10%  
U.S. federal statutory rate (as a percent) 35.00% 35.00% 35.00% 35.00%  
Utilization of foreign tax credits (as a percent) (3.40%)   (6.40%)    
Addition to net favorable items (as a percent) (2.20%)   (4.10%)    
Decrease in deferred tax liabilities related to taxes on unremitted foreign earnings (as a percent)   (3.50%)   (5.70%)  
Tax benefits due to net decreases in tax liabilities associated with uncertain tax positions due to the expiration of the statute of limitations (as a percent)       (6.40%)  
Accrued amount related to uncertain tax positions $ 9,784   $ 9,784   $ 10,426